Just brainstorming….
One of the PCV setups for a mid 60s 283 v8 is pipe thread on one end and a barb on the other. Could you adapt that to the manifold end, use a very short section of rubber to a length of Nicopp in a size of your choice, and then hardline all the way to the PCV riser?
Wouldn’t be totally stock appearing, but the short section of rubber would be in a pretty hard to spot.
